Now, in another attempt to “keep out terrorists”, the Trump administration is mulling over European visa restrictions.

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LOCK DOWN: The Trump administration are considering making it harder to enter the US

US Department of Homeland Security director John Kelly said on Wednesday that the US needs to “re-examine its agreement with Europe”.

“We are the Super Bowl in terms of terrorists. That's where they wanna come.”

John Kelly

This agreement waives visas for visits less than 90 days. His argument was “Europeans posed a potential terror risk”.

"We have to start looking very hard at that [visa waiver] program," the director said during an appearance at George Washington University in Washington.

"Not eliminating it and not doing anything excessive but look very hard at that program.

"We are the Super Bowl in terms of terrorists. That's where they wanna come."

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The visa waiver program was first established in 1986 and has allowed people from 38 countries to visit America for a certain time period without needing a visa.

However, residents of these countries must still pass through the Electronic System for Travel Authorisation for the US government to assess risk.

This isn’t the first time the waiver program has been strengthened. After the November 2015 Paris attacks former US President Barack Obama put further security measures in place.

According to the US Department of Commerce, entrants to the US on the visa waiver program spent a collective $84billion (£65billion) on goods and services in 2014 – so introducing a restriction could cut down the boost to the US economy.

“I hate to use the word, but it would be devastating,” SVP of global communication for NYC & Company – the official NYC tourism board – told Travel and Leisure.

“So many destinations are fighting for the same tourism dollar, so people will gravitate to places that are more welcoming.”